Merge "Force-clear nav bar flags when phone finishes booting." into rvc-dev...

Merge "Force-clear nav bar flags when phone finishes booting." into rvc-dev am: b236787b am: 6fd0d10f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11813213

Change-Id: I1b5174bf8655a8b3d80823a677f9360d930ddf05